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  1. /*
  2.  * Copyright (c) 2007 Pavel Jancik, Michal Kebrt
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup arm32mm
  30.  * @{
  31.  */
  32. /** @file
  33.  *  @brief Paging related functions.
  34.  */
  35.  
  36. #include <arch/mm/page.h>
  37. #include <genarch/mm/page_pt.h>
  38. #include <mm/page.h>
  39. #include <align.h>
  40. #include <config.h>
  41. #include <arch/exception.h>
  42. #include <typedefs.h>
  43. #include <arch/types.h>
  44. #include <interrupt.h>
  45. #include <arch/mm/frame.h>
  46.  
  47.  
  48. /**
  49.  * Initializes kernel adress space page tables, sets abourts exceptions vectors
  50.  */
  51. void page_arch_init(void)
  52. {
  53.     uintptr_t cur;
  54.     int flags;
  55.  
  56.     page_mapping_operations = &pt_mapping_operations;
  57.  
  58.     flags = PAGE_CACHEABLE;
  59.  
  60.     // PA2KA(identity) mapping for all frames until last_frame
  61.     for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {
  62.         page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
  63.     }
  64.    
  65.     // create mapping for exception table at high offset
  66.     #ifdef HIGH_EXCEPTION_VECTORS
  67.         /* Note: this mapping cann't be done by hw_map because fixed
  68.             exception vector is stored at fixed virtual address
  69.             reserve frame for exception table
  70.         */
  71.         void* virtaddr = frame_alloc(ONE_FRAME, FRAME_KA);
  72.         page_mapping_insert(AS_KERNEL, EXC_BASE_ADDRESS, KA2PA(virtaddr), flags);
  73.     #else
  74.         #error "Only high eception vector supported now"
  75.     #endif
  76.  
  77.     as_switch(NULL, AS_KERNEL);
  78.  
  79.     boot_page_table_free();
  80. }
  81.  
  82. /**
  83.  * Map device into kernel space.
  84.  *
  85.  * This function adds mapping of physical address that is read/write only
  86.  *  from kernel and not bufferable.
  87.  *
  88.  * @param physaddr Physical addres where device is connected
  89.  * @param size Length of area where device is present
  90.  * @return Virtual address where device will be accessable
  91.  */
  92. uintptr_t hw_map(uintptr_t physaddr, size_t size)
  93. {
  94.     if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH)) {
  95.         panic("Unable to map physical memory %p (%d bytes)", physaddr, size)
  96.     }
  97.  
  98.     uintptr_t virtaddr = PA2KA(last_frame);
  99.     pfn_t i;
  100.     for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++) {
  101.         page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i),
  102.             PAGE_NOT_CACHEABLE | PAGE_READ | PAGE_WRITE | PAGE_KERNEL);
  103.     }
  104.  
  105.     last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
  106.     return virtaddr;
  107. }
  108.  
  109.  
  110. /** @}
  111.  */
  112.  
  113.